GTX 680s are voltage locked aren't they?
Why are you still using Afterburner? From what I understand 2.2.0 is borked and has been causing problems for weeks. I have no problems with Trixx at all, have you tried that? There are plenty of people who are successfully raising the voltage and overclocking. If you are having problems then something is happening on your end.
Anyway it sounds like youd be happier with nvidia, hope you get it all sorted
edit: also, you may look into trying ASUS' GPU Tweak. I have only used it a little myself but from what I've heard it works fine

2.2 final works fine for OC'ing, not sure what issue you guys are having. You have to run it with the -xcl argument, and you also have to be wary of the "apply overclock at system startup" and "synchronize all gpu's" options. Those can cause instability sometimes with AB....anyway, works fine here.

Yea, I read all the crap ppl complained about 2.2 and was like omg they broke it. Then I wiped my os while testing 12.4whql which sucked btw, and I ran AB 2.2. I had ZERO issues with it. What the heck are ppl complaining about???

Yea, I read all the crap ppl complained about 2.2 and was like omg they broke it. Then I wiped my os while testing 12.4whql which sucked btw, and I ran AB 2.2. I had ZERO issues with it. What the heck are ppl complaining about???

Getting stuck in 2d clocks, stuttering, artifacts, crashes, random fan changes/lack of fan movement, you know the usually . And to the OP you are extremely right, just got rid of trixx, using CCC now, problems solved . I thought I had solved everything and my card was bugged with artifacts from time to time ... NOPE, +rep as I don't think I have yet, and for once again helping.

I am on 12.4 whql which was working fine with all of my games until I installed AB and UOM. All of my benches work brilliantly overclocked but as soon as I tried to play Crysis 2 it was a no go. Even after unistalling AB and all AMD drivers and reinstalling from scratch Crysis 2 will not run at all now...

I am on 12.4 whql which was working fine with all of my games until I installed AB and UOM. All of my benches work brilliantly overclocked but as soon as I tried to play Crysis 2 it was a no go. Even after unistalling AB and all AMD drivers and reinstalling from scratch Crysis 2 will not run at all now...

I knew you were on 12.4... That driver has issues with crossfire scaling. Allgamer can chime in on this one. Hambonie said 8.97 aka 12.5 beta was good all around btw.

My card seems to be stuck at 8x PCIe speed. Does anyone know how to fix this?

It's not stuck, the lanes will automatically downclock themselves to save on power. Mine sits at 4x to 8x at idle as well.

To those of you with Crysis 2 issues:
No clue what your problems are honestly. I'm on 12.4 WHQL, using the latest MSI AB, and I use the -xcl method plus profiles (stock for 2D, overclocked for 3D). Crysis 2 works beautifully here, 99% GPU usage and 40-45 FPS or so at 2560x1600 maxed out with DX11 + High Res texture pack.